Wow, those things must be heavy! If you've got an easy way to get all that into the field, making stakes from steel conduit shouldn't be a problem. How about 1/2 inch conduit with a slot cut across one end and the other end cut to a point? Adjust length for local snow fall.

A single duck is obvious and easily explained. Three or more is a flock and is logical and understandable. But two are always a paradox.